Possibly related to PS *ḥabal- 'foetus, umbilical cord', see SED I No. 110
perhaps borrowed from Cushitic
For possible semantic parallels (“leaf” derived from “to peel, to strip off”) v. Buck 1949:525 (cf. also Appleyard 1977:40).
The origin of Proto-EthS *ḳʷsl ‘to be wounded’ is uncertain. Leslau tentatively accepts A. Dillmann’s equation with Arb. qṣl = qṭˁ with dissimilation of emphatics (LLA 431, LA 11 664).